290 pistons
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=32897
Printed Date: Apr/19/2024 at 12:45pm
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Topic: 290 pistons
Posted By: jonb79
Subject: 290 pistons
Date Posted: Sep/23/2011 at 4:52pm
| Does anyone make or sell aftermarket 290 pistons? |
Replies:
Posted By: mramc
Date Posted: Sep/23/2011 at 5:45pm
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Per say they are not listed as 290 V-8 pistons, but the bore size is the same for 304 V-8s at 3.75 inches. If your rebuilding an engine you need to rebalance the engine any way and the different in block deck height and rod length is in the rod. You use a 290 rod for a 290 and a 304 rod for a 304, but the piston for all practical proposes are the same. So, look for a 304 piston instead of a 290 piston. Summit racing gives you 20 different choices, per say. LRDaum
------------- LRDaum |
Posted By: purple72Gremlin
Date Posted: Sep/23/2011 at 6:33pm
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mramc wrote:Posted By: poormansMACHINE
Date Posted: Sep/23/2011 at 6:38pm
| Didn't Egge have them? |
Posted By: 74Bubblefender
Date Posted: Sep/23/2011 at 6:41pm
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We also sell custom forged 290 pistons in any compression. ------------- We are just about to forge new AMC V8 crankshafts.. please check here http://www.bulltear.com/forums/showthread.php?19564 |
Posted By: mramc
Date Posted: Sep/24/2011 at 11:03am
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Ok, maybe your right when I went back and looked at the specs, but there not that much difference like 0.045 of inch or some thing like that, and Mr Bulltear has a some 290s , but you notice the word custom. Egge Machine most likely has them also. None of them is going to be cheap. LRDaum ------------- LRDaum |
Posted By: jonb79
Date Posted: Sep/24/2011 at 1:19pm
| Yea I seen that, if I'm going to spend that kind of money maybe I'll think about getting a 390 or 401 to rebuild. I have a lead on a 290 thats reasonable but with the money I spend on getting the 290 to where I want to go might not be worth doing. |
Posted By: Class Guy
Date Posted: Sep/24/2011 at 4:44pm
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Mad Dog sells a 290 engine kit through their eBay store:
http://cgi.ebay.com/ebaymotors/290-AMC-Rambler-AMX-Engine-master-kit-Class-II-perf-/380369343809?pt=Motors_Car_Truck_Parts_Accessories&hash=item588fc79541 - http://cgi.ebay.com/ebaymotors/290-AMC-Rambler-AMX-Engine-master-kit-Class-II-perf-/380369343809?pt=Motors_Car_Truck_Parts_Accessories&hash=item588fc79541
Maybe they sell the pistons separately. Call them to see. Maybe their pistons are from Egge.
Nylen used to make replacement pistons under their part number C311 and Perfect Circle had them. Of course, so many of those small piston manufacturing companies have been bought up and consolidated that sources for pistons for that engine is verey limited. I suspect the Egge pistons are manufactured by Badger,
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Posted By: SC397
Date Posted: Sep/24/2011 at 7:59pm
| I have a set of cast high compression +.040" over pistons for a 290 if you are interested. The pin size is .872 |
Posted By: pacerman
Date Posted: Sep/24/2011 at 8:01pm
------------- Happiness is making something out of nothing. |
Posted By: SC397
Date Posted: Sep/24/2011 at 8:12pm
| Egge has their own aluminum foundry? Show me. |
Posted By: poormansMACHINE
Date Posted: Sep/24/2011 at 8:23pm
What were you wanting to accomplish on what budget? |
Posted By: jonb79
Date Posted: Sep/25/2011 at 6:03am
| I would like to get anywhere from 300 to 350 hp, im just wondering if thats possible and if its worth the hassle . |
Posted By: jonb79
Date Posted: Sep/25/2011 at 6:07am
| I have time with this project, I still have a running engine in my car so I can spend money here and there. |
Posted By: pacerman
Date Posted: Sep/25/2011 at 6:54am
http://www.egge.com/HISTORY - http://www.egge.com/HISTORY
Joe ------------- Happiness is making something out of nothing. |
Posted By: poormansMACHINE
Date Posted: Sep/25/2011 at 7:46am
forged pistons and a turbo |
Posted By: jonb79
Date Posted: Sep/25/2011 at 10:38am
| I guess a turbo is that replacement for displacement. |
Posted By: poormansMACHINE
Date Posted: Sep/25/2011 at 12:00pm
And a whole bunch more streetable. |
Posted By: wantajav
Date Posted: Sep/25/2011 at 7:32pm
|
I'm in the same boat.
300 hp and streetable for a 290 is a tall order.
401's are fairly pricey compared to the 360 you can get for nothing.
So I have a 360 in boxes I essentially got for free, and for the 290, I'm planning on 304 heads, bigger intake valves, 268 cam, aluminum intake, headers, and I'll be lucky to get a true 300. The weight of a 360 = 290, so why are we killing ourselves? Just for fun....but to get the best results
I'm figuring my 290 dream set up is more likely 250 hp tops...add a 75 shot that's 325....if that otherwise more N20 = definitely forged pistons, not sure if a carbed 290 stock fuel system can even handle a 75 shot
Meanwhile a 360 is easily a 300 hp almost stock add a 75 shot there 375 AND hooks up to a better transmission
Just some ideas, no expert here by a long shot
Mike
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Posted By: jonb79
Date Posted: Oct/01/2011 at 10:58pm
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I'm been doing some research on this, getting a 290 to do 300 to 325HP can happen but the money you spend going this route you can have a 360 that does more HP. Even though I'll have to get another flywheel I think I'll still be ahead with a 360. I was under the impression a 290 could perform out like a ford or chevy 302 or even a chrysler 318 with some mods but the 290 lacks on bore spacing when compared to these other engines. |
Posted By: poormansMACHINE
Date Posted: Oct/01/2011 at 11:17pm
| 290 through 401 have the same bore spacing so if it's lacking then they're all lacking. |
Posted By: Buzzman72
Date Posted: Oct/01/2011 at 11:19pm
|
SHHHHHHHHHH!
Some Chevy guy probably told him that...so it's just GOTTA be gospel!  ------------- Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects. |
Posted By: 17tamx
Date Posted: Oct/01/2011 at 11:30pm
|
Isn't the bore spacing the same between a 290 and a 401? Bore spacing is based on the dimensional limitations of the basic engine block design. The AMC thinwall casting Gen II and Gen III V8's originally designed by Dave Potter are neither small block or big block but really a medium block. The external dimensions are the same for all the engines. The internal dimensions of the castings where changed as both bore and stroke increased to give larger displacement numbers.
Don't we have 4.40" Bore spacing on our AMC Gen II & Gen III V8's? I hear about guys running 4.225" (4.165 plus .060) on their 390 and 401's all the time. Is anyone running a larger bore than 4.225" at this time? ------------- Kirk P. Fletcher 70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
Posted By: wantajav
Date Posted: Oct/02/2011 at 7:31am
| bore spacing = distance from bore center to bore center, not the diameter of the bore itself |
Posted By: wantajav
Date Posted: Oct/02/2011 at 7:34am
| 4.75" the same as a Buick 400-455 |
Posted By: jonb79
Date Posted: Oct/02/2011 at 8:53am
| Correct me if I'm wrong but isn't the bore on a 290 3.75 and the stroke 3.28. |
Posted By: wantajav
Date Posted: Oct/02/2011 at 9:05am
| four 3.75" holes that are located 4.75" apart in the engine block. |
Posted By: bigbad69
Date Posted: Oct/02/2011 at 9:22am
Nowhere in this thread have you mentioned the purpose of the car. Is it street, street/strip, or race only? That makes a big difference on the engine you build. Street performers really need low end grunt because you can't achieve high RPM for very long. For street/strip you want a wide power band to take advantage of higher RPMs but still have low end for the street. For race only, you have to decide what class you want to be in, then build the engine (and car) specifically for that class. A guy I know has a 318 in his Dart (street only). It has 340 heads, an upgraded cam, intake, and carb. He says it runs like a 340 and he's right. But that's a lot of work to get it to the level of a stock 340. If he started with a 340 or 360 and did the same work, he would be in the range you are looking for. ------------- 69 Javelin SST BBO 390 T10 |
Posted By: poormansMACHINE
Date Posted: Oct/02/2011 at 9:40am
| Are you sure you're ready to build an engine? |
Posted By: jonb79
Date Posted: Oct/02/2011 at 4:05pm
| Im going to build something for the street and once inawhile at the strip. Most likely going to buy a 360. love that chevy guy comment. |
Posted By: carnuck
Date Posted: Oct/03/2011 at 12:01am
Wonder if the 4.0L pistons would work in a 290 build? I have a couple dead 4.0Ls ('91 and '93) I can steal the old pistons from. 
------------- Got an Eagle? http://forums.amceaglesden.com" rel="nofollow - http://forums.amceaglesden.com |
Posted By: Class Guy
Date Posted: Oct/03/2011 at 10:32am
|
Four issues:
1) The compression distance of the 4.0 pistons is the same as 2-bbl 290 pistons, which will put the piston about .050"-.060" in the hole and not be good for compression.
2) The dish in the 4.0 pistons is around 12 cc which is much more than stock pistons. Again, not good for compression.
3) Valve relief pockets will have to be machined into the pistons.
4) You will have to bore the 290 block .125". Be sure to sonic check the block first. I have not seen a 290 block that could not be bored that much, but I have only checked 6.
|
Posted By: carnuck
Date Posted: Oct/03/2011 at 10:42am
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I guess I'll save those for when I do the 304 then.
------------- Got an Eagle? http://forums.amceaglesden.com" rel="nofollow - http://forums.amceaglesden.com |
Posted By: amx007
Date Posted: Dec/08/2018 at 8:16pm
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I’d like to know a price for a set 30 over ty 290 ------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Trader
Date Posted: Dec/09/2018 at 6:04am
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Egge has them, $444 set: https://egge.com/part/egg-1000-l2247-8/" rel="nofollow - https://egge.com/part/egg-1000-l2247-8/
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Posted By: mixed up
Date Posted: Dec/09/2018 at 10:31pm
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reading this post don't under estimate the performance of the 290 with alittle work they run and hold up very well my 290 in my rambler is a .030 over 10.5.1 forged piston balanced torqer intake 750 carb 540 lift 304 duration very street able 410 gear in the rear 4sp run 12.30 in a 1/4 6000 launch comes thru the trap at 5500 I say not bad for a small cubic inch motor and yes it will put a hurt on a small block chevy or ford there is no valve work or porting done on he heads that this years project this motor surprised me on it performace ------------- 69 amx 290 auto 65 220 290 4spd 80 ford fairmont |
Posted By: farna
Date Posted: Dec/10/2018 at 5:55am
|
258 pistons should work, it has the same bore as the 290 (3.75"). Not sure about compression height and dish though, could be the same issues as the 4.0L -- a little lower compression when used in a 290. ------------- Frank Swygert |
Posted By: nextofkin
Date Posted: Dec/10/2018 at 7:17am
| mixed up show your build and work on the heads when you do it |